blinkers — If you describe someone as wearing blinkers, you think that they have a narrow point of view and are not taking other people's opinions into account.
blinker — a flashing light for sending messages, as a warning device, etc, such as a direction indicator on a road vehicle
bifocals — Bifocals are glasses with lenses made in two halves. The top part is for looking at things some distance away, and the bottom part is for reading and looking at things that are close.